Y7 Science Controlled Assessment Topics & Keywords

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1 Y7 Science Controlled Assessment Topics & Biology Cells. Cells as the fundamental unit of living organisms, including how to observe cell structure using a light microscope. The functions of the cell wall, cell membrane, cytoplasm, nucleus, vacuole, mitochondria and chloroplasts. The similarities and differences between plant and animal cells. The role of diffusion in the movement of materials in and between cells. The adaptations of some single cell organisms. The organisation of multicellular organisms: from cells to tissues to organs to systems to organisms. Cell: The unit of a living organism, contains parts to carry out life processes. Uni-cellular: Living things made up of one cell. Multi-cellular: Living things made up of many types of cell. Tissue: Group of cells of one type. Organ: Group of different tissues working together to carry out a job. Diffusion: One way for substances to move into and out of cells. Structural adaptations: Special features to help a cell carry out its functions. Cell membrane: Surrounds the cell and controls movement of substances in and out. Nucleus: Contains genetic material (DNA) which controls the cell s activities. Vacuole: Area in a cell that contains liquid and can be used by plants to keep the cell rigid and store substances. Mitochondria: Part of the cell where energy is released from food molecules. Cell wall: Strengthens the cell. In plant cells it is made of cellulose. Chloroplast: Absorbs light energy so the plant can make food.

2 Digestion. The content of a healthy human diet: carbohydrates, lipids (fats and oils), proteins, vitamins, minerals, dietary fibre and water, and why each is needed. Calculations of energy requirements in a healthy daily diet. The consequences of imbalances in the diet, including obesity, starvation and deficiency diseases. The tissues and organs of the human digestive system, including adaptations to function and how the digestive system digests food. The importance of bacteria in the human digestive system. Plants making carbohydrates in their leaves by photosynthesis and gaining mineral nutrients and water from the soil via their roots. Enzymes: Substances that speed up the chemical reactions of digestion. Dietary fibre: Parts of plants that cannot be digested, which helps the body eliminate waste. Carbohydrates: The body s main source of energy. There are two types: simple (sugars) and complex (starch). Lipids (fats and oils): A source of energy. Found in butter, milk, eggs, nuts. Protein: Nutrient your body uses to build new tissue for growth and repair. Sources are meat, fish, eggs, dairy products, beans, nuts and seeds. Stomach: A sac where food is mixed with acidic juices to start the digestion of protein and kill microorganisms. Small intestine: Upper part of the intestine where digestion is completed and nutrients are absorbed by the blood. Large intestine: Lower part of the intestine from which water is absorbed and where faeces are formed. Gut bacteria: Microorganisms that naturally live in the intestine and help food break down. Variation. The variation between individuals within a species being continuous or discontinuous The variation between species and between individuals of the same species means some organisms compete more successfully, which can drive natural selection Changes in the environment may leave individuals within a species, and some entire species, less well adapted to compete successfully and reproduce, which in turn may lead to extinction Species: A group of living things that have more in common with each other than with other groups. Variation: The differences within and between species. Continuous variation: Where differences between living things can have any numerical value. Discontinuous variation: Where differences between living things can only be grouped into categories.

3 Y7 Science Controlled Assessment Topics & Chemistry Elements. To understand the Dalton atomic model. To explain the differences between atoms, elements and compounds. To be proficient in using chemical symbols and formulae to represent elements and compounds. To understand the concept of a pure substance. To understand the physical and chemical properties of different elements and compounds; including metals, non-metals. Elements: What all substances are made up of, and which contain only one type of atom. Atom: The smallest particle of an element that can exist. Molecules: Two to thousands of atoms joined together. Most non-metals exist either as small or giant molecules. Compound: Pure substances made up of two or more elements strongly joined together. Chemical formula: Shows the elements present in a compound and their relative proportions. Polymer: A molecule made of thousands of smaller molecules in a repeating pattern. Plastics are man- made polymers, starch is a natural polymer. Metals & Non-metals. The properties of metals and non-metals The chemical properties of metal and non-metal oxides with respect to acidity. The order of metals and carbon in the reactivity series Metals: Shiny, good conductors of electricity and heat, malleable and ductile, and usually solid at room temperature. Non-metals: Dull, poor conductors of electricity and heat, brittle and usually solid or gaseous at room temperature. Displacement: Reaction where a more reactive metal takes the place of a less reactive metal in a compound. Oxidation: Reaction in which a substance combines with oxygen. Reactivity: The tendency of a substance to undergo a chemical reaction.

4 Periodic Table. The physical and chemical properties of different elements. The principles underpinning the Mendeleev Periodic Table. The layout of Periodic Table: periods and groups; metals and non-metals. How patterns in reactions can be predicted with reference to the Periodic Table Periodic table: Shows all the elements arranged in rows and columns. Physical properties: Features of a substance that can be observed without changing the substance itself. Chemical properties: Features of the way a substance reacts with other substances. Groups: Columns of the periodic table. Periods: Rows of the periodic table. Acids & Bases. Define acids and alkalis in terms of neutralisation reactions Use the ph scale for measuring acidity/alkalinity Use indicators to show ph Know that reactions of acids with metals to produce a salt plus hydrogen Know that reactions of acids with alkalis to produce a salt plus water ph: Scale of acidity and alkalinity from 0 to 14. Indicators: Substances used to identify whether unknown solutions are acidic or alkaline. Base: A substance that neutralises an acid - those that dissolve in water are called alkalis. Concentration: A measure of the number of particles in a given volume.

5 Y7 Science Controlled Assessment Topics & Physics Sound. That frequencies of sound waves are measured in hertz (Hz). That sound echoes are reflections and materials will absorb of sound energy That sound needs a medium to travel. Compare the speed of sound in air, in water and in solids. That sound is produced by vibrations of objects, e.g. in loud speakers, detected by their effects on microphone diaphragm and the ear drum. That sound waves are longitudinal. Compare auditory range of humans and animals. Vibration: A back and forth motion that repeats. Longitudinal wave: When the direction of the vibration is the same as that of the wave. Volume: How loud or quiet a sound is, in decibels (db). Pitch: How low or high a sound is. A low (high) pitched sound has a low (high) frequency. Amplitude: The maximum amount of vibration, measured from the middle position of the wave, in metres. Wavelength: The distance between two corresponding points on a wave, in metres. Frequency: The number of waves produced in one second, in Hertz (Hz). Vacuum: A space with no particles of matter in it. Oscilloscope: Device for viewing patterns of sound waves that have been turned into electrical current. Absorption: When energy is transferred from sound to a material. Auditory range: The lowest and highest frequencies that a type of animal can hear. Echo: Reflection of sound waves from a surface back to the listener.

6 Light. Know the similarities and differences between light waves and waves in matter That light waves can through a vacuum at the speed of light That light can transmit through materials That light can be absorbed by a surface, or scattered or reflected from a surface To use ray models to explain imaging in mirrors, the pinhole camera, the refraction of light and action of convex lens in focusing in the human eye That light transfers energy from source to absorber leading to chemical and electrical effects; e.g. photo-sensitive material in the retina and in cameras That colours are different frequencies of light That white light can be split into a colour spectrum using prisms That objects can appear to be different colours, due to the effects of absorption and reflection. Incident ray: The incoming ray. Reflected ray: The outgoing ray. Normal line: From which angles are measured. At right angles to the surface. Angle of reflection: Between the normal and the reflected ray. Angle of incidence: Between the normal and the incident ray. Refraction: Change in direction of light going from one material into another. Absorption: When energy is transferred from light to a material. Scattering: When light bounces off an object in all directions. Transparent: A material that allows all light to pass through it. Translucent: A material that allows some light to pass through it. Opaque: A material that allows no light to pass through it. Convex lens: A lens that is thicker in the middle which bends light rays towards each other. Concave lens: A lens that is thinner in the middle which spreads out light rays. Retina: Layer at the back of the eye with light detecting cells and where image is formed.

7 Energy Transfers. That energy as a quantity that can be quantified and calculated. That the total energy has the same value before and after a change. Compare the starting with the final conditions of a system and describing increases and decreases in the amounts of energy. Thermal energy store: Filled when an object is warmed up. Chemical energy store: Emptied during chemical reactions when energy is transferred to surroundings. Kinetic energy store: Filled when an object speeds up. Gravitational potential energy store: Filled when an object is raised. Elastic energy store: Filled when a material is stretched or compressed. Dissipated: Become spread out wastefully Energy Costs. Compare power ratings of appliances in watts (W, kw) Compare amounts of energy transferred (J, kj, kw hour) Compare fuels and energy resources (renewable and nonrenewable) Evaluate the global demand of energy resources Power: How quickly energy is transferred by a device (watts). Energy resource: Something with stored energy that can be released in a useful way. Non-renewable: An energy resource that cannot be replaced and will be used up. Renewable: An energy resource that can be replaced and will not run out. Examples are solar, wind, waves, geothermal and biomass. Fossil fuels: Non-renewable energy resources formed from the remains of ancient plants or animals. Examples are coal, crude oil and natural gas.

8 Gravity. Know how to calculate the size of the gravity force using weight = mass x gravitational field strength (g) Know that on Earth g=10 N/kg. Know that gravitational field strength is different for other planets and stars Know that there are gravity forces between Earth and Moon, and between Earth and Sun which cause them to move in circular paths called orbits Mass: The amount of stuff in an object (kg) Weight: The force of gravity on an object (N) Non-contact force: One that acts without direct contact Gravitational field strength: The force from gravity on 1kg (N/kg) Field: The area where other objects feel a gravitational force Contact Forces. Know forces are pushes or pulls, arising from the interaction between two objects. Use force arrows on diagrams. Add forces in one dimension, to decide if forces are balanced or unbalanced. Know forces include o deform objects; stretching and squashing e.g. springs o rubbing and friction between surfaces, o pushing things out of the way o resistance to motion of air and water Know forces are measured in Newtons. Know a Newtonmeter works by how much an objects stretches or compresses as the force is changed. Know force is linked to extension by linear relation called Hooke s Law. Equilibrium: State of an object when opposing forces are balanced. Deformation: Changing shape due to a force. Linear relationship: When two variables are graphed and show a straight line which goes through the origin, and they can be called proportional. Newton: Unit for measuring forces (N). Resultant force: Single force which can replace all the forces acting on an object and have the same effect. Friction: Force opposing motion which is caused by the interaction of surfaces moving over one another. It is called drag if one is a fluid. Tension: Force extending or pulling apart. Compression: Force squashing or pushing together. Contact force: One that acts by direct contact.

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